EP0073314A1 - Système de transmission pour une utilisation multiple bidirectionnelle d'une fibre optique - Google Patents

Système de transmission pour une utilisation multiple bidirectionnelle d'une fibre optique Download PDF

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Publication number
EP0073314A1
EP0073314A1 EP82105675A EP82105675A EP0073314A1 EP 0073314 A1 EP0073314 A1 EP 0073314A1 EP 82105675 A EP82105675 A EP 82105675A EP 82105675 A EP82105675 A EP 82105675A EP 0073314 A1 EP0073314 A1 EP 0073314A1
Authority
EP
European Patent Office
Prior art keywords
light
optical
selective
core
light sources
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82105675A
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German (de)
English (en)
Other versions
EP0073314B1 (fr
Inventor
Antonius Nicia
Dieter Rittich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Kommunikations Industrie AG
Original Assignee
Philips Kommunikations Industrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Kommunikations Industrie AG filed Critical Philips Kommunikations Industrie AG
Priority to AT82105675T priority Critical patent/ATE17426T1/de
Publication of EP0073314A1 publication Critical patent/EP0073314A1/fr
Application granted granted Critical
Publication of EP0073314B1 publication Critical patent/EP0073314B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/2931—Diffractive element operating in reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/29311—Diffractive element operating in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/2937—In line lens-filtering-lens devices, i.e. elements arranged along a line and mountable in a cylindrical package for compactness, e.g. 3- port device with GRIN lenses sandwiching a single filter operating at normal incidence in a tubular package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • the invention relates to a method for the multiple use of an optical waveguide core in wavelength division multiplex, with a plurality of light sources with different wavelengths, which are in at least two different wavelength ranges, with a number of broadband light receivers corresponding to the number of light sources, each of which has a multiplexer. or are connected to the optical fiber core via demultiplexer arrangements.
  • An optical fiber branch with at least three optical fibers is already known, each consisting of a light-conducting core and a cladding, the refractive index of which is smaller than the refractive index of the core, the polished end face of a common optical fiber being bonded to the polished end faces of the branching optical fibers, in which the diameter of the cores of the branching optical fibers are smaller than the diameter of the core of the common optical fiber (DE-GM 80 30 152).
  • This branch can be used as a multiplexer, with which the light of several light sources, regardless of their wavelength, can be fed into a common optical fiber.
  • the number of light sources that can be coupled in this way is still limited.
  • This device makes it possible to route a number of optical signals of different wavelengths to separate light receivers, but here too the number of receivers that can be used is still limited.
  • the invention has for its object to show a way for the improved use of fiber optic cables using the most widely known and proven components and to create a modular system for creating universally usable message and signal transmission systems.
  • This object is achieved in that the light sources of a waveband are connected via a non-selective coupling arrangement to a common optical fiber, that the optical fibers that carry light from different wavebands are connected via window-selective coupling arrangements to the optical fiber core, and that the light receivers of a waveband can be connected to a common FO via a selective coupling arrangement.
  • a light guide branch is used as the non-selective coupling arrangement, which connects several light sources with a common optical fiber, in which the branching light guides have a smaller core diameter than the core diameter of the common optical fiber.
  • an arrangement is used as the window-selective coupling arrangement in which an inclined one against the optical axis between two spherical lenses A mirror is arranged, which is transparent to the light rays of one of the wave ranges used, but is reflective to the light rays of the other wave range used.
  • a device for decoupling optical signals of different wavelengths from one optical fiber into a plurality of separate optical fibers is used as a selective decoupling arrangement, in which a reflective diffraction grating is inclined towards the optical axis of the beam path and in that between the end faces of the optical fiber and the Diffraction grating is arranged a spherical lens.
  • This configuration has also been tested and shows excellent values in terms of attenuation, selectivity and cross-talk attenuation.
  • a controllable light attenuator is arranged in front of each light receiver, in which a finely adjustable damping body is attached in the beam path between two spherical lenses.
  • the damping body can be used as a pointed or rounded pin or an adjustable gray filter at its end protruding into the beam path.
  • the former embodiment is particularly inexpensive, the latter embodiment enables a particularly wide control range.
  • the light receivers are each fastened in a plug pin, in the light exit opening of which a spherical lens is arranged.
  • the light transmitters are arranged in the same way as the light receivers in a plug pin with ball lenses.
  • the fiber optic core connecting two separate stations is designated by 1.
  • the first station shown on the left in the figure has 4 light sources or light transmitters S1-S4, which emit light with different wavelengths.
  • the wavelengths shown in the figure are only examples of usable wavelengths and their distances from one another, as can be controlled with the components that are described further.
  • the light sources S1-S4 are connected to optical fibers, which are preferably designed as single-mode optical fibers, via connectors with two spherical lenses, which can be designed to be pluggable.
  • the optical fibers coming from the light sources S1-S4 are connected via a non-selective coupling arrangement 6 to a common optical fiber 2, which is preferably designed as a gradient fiber.
  • the non-selective coupling arrangement 6 is, as indicated in the figure, a light guide branch, as is shown in somewhat more detail in FIG. 2.
  • the common fiber optic cable 2 coming from the light sources S1-S4 is connected to the fiber optic core 1 via a window-selective coupling arrangement 10.
  • An embodiment of the coupling arrangement 10 is shown in more detail in FIG. 3.
  • the mirror located in the coupling arrangement 10 is designed so that it has a reflecting effect for light with the wavelengths of the light sources S1-S4. This light from the common fiber optic cable 2 is thus coupled into the fiber optic core 1, directed to the second station indicated on the right side of the figure, and enters there window-selective coupling arrangement 11.
  • Their mirror is designed so that it is transparent to the wavelengths mentioned.
  • This light is thus directed into the common optical fiber 5 and arrives at the selective decoupling arrangement 9.
  • a decoupling arrangement is described in more detail in FIG. 4.
  • the inclined diffraction grating in the decoupling arrangement 9 distributes the light coming via the common optical fiber 5 in a wavelength-dependent manner to the individual optical fibers which lead to the light receivers E1-E4.
  • the light receivers E1-E4 are connected to the associated individual optical fibers via connection arrangements with two spherical lenses.
  • a double arrow also indicates that this connection, which can advantageously also be made pluggable, contains an attenuator, as is shown in greater detail in FIGS. 5 and 6.
  • the signal transmission in the opposite direction from the second station shown on the right side of the figure to the first station shown on the left side of the figure is carried out in the same way by the four light sources S5-S8, which are connected to the common optical fiber via the non-selective coupling arrangement 7 3 are connected, which in turn is connected to the fiber optic core 1 via the window-selective coupling arrangement 11.
  • this coupling arrangement 11 is designed such that the mirror located in it is reflective for the longer wavelengths of the transmitters S5-S8. This configuration results in a more favorable signal / noise ratio than if the same coupling arrangement 10 were used at this point.
  • the mirror located in the coupling arrangement 10 is transparent to the wavelengths of the transmitters S5-S8 and thus connects the fiber optic core 1 to the common fiber optic cable 4, the light of which via the selective coupling arrangement 8 in turn is directed onto the associated light receiver E5-E8 is distributed. It has been shown that the system-related light attenuation, ie without taking into account the attenuation of the fiber optic core 1, from one of the transmitters S1-S8
  • FIG. 2 schematically shows an optical fiber branching as it is advantageously used as a non-selective coupling arrangement 6 or 7 in FIG. 1.
  • the common fiber optic cable 21 has the core diameter D.
  • the boundary of the core is designated 21b.
  • the end faces 22a, 23a, 24a and 25a of the branching fiber optic cables 22, 23, 24 and 25 are glued onto the visible end face of the common optical fiber 21.
  • the core diameter d of the branching fiber optic cables 22 to 25 fulfills the condition that it is smaller than the core diameter D of the common fiber optic cable 21, but it is still so large that the ends of the branching fiber optic cables 22 to 25 are separated by two Surfaces arranged at right angles to one another, for example 22c and 22d, have to be machined to such an extent that the core edges, for example 22b, do not project beyond the core edge 21b.
  • This example roughly corresponds to the situation when the branching fiber optic cables 22 to 25 are also gradient fibers. If monomode fibers are used at this point, the core diameter of which is usually much smaller than that of gradient fibers, the ends of the branching fiber optic cables can be completely or partially eliminated. This further reduces the system-related light attenuation of such an optical fiber branch.
  • a window-selective coupling arrangement as designated by 10 and 11 in FIG. 1, is shown schematically in FIG. 3.
  • the fiber optic core is designated here by 31, the common fiber optic cable coming from the transmitters by 32. Both are fastened together in a plug pin 35a, which carries a ball lens 35 in front of the light exit opening.
  • the common optical fiber going to the receivers is denoted by 34, which is fastened in a plug pin 36a in front of a spherical lens 36.
  • the plugs Pins 35a and 36a are inserted into a connecting sleeve 38 aligned with each other.
  • a mirror 37 is attached in the beam path 30 and is transparent to the light coming from the fiber optic core 31.
  • the light coming from the transmitters via the common fiber optic 32 is reflected by the mirror 37, however, and guided into the fiber optic core 31 via the ball lens 35.
  • This desired mirror property can be achieved in a targeted manner by applying thin layers, for example by vapor deposition, on a flat glass plate.
  • the light losses both when passing through the mirror and when reflecting on the mirror are in the order of 0.7 to 0.8 dB.
  • FIG. 4 shows a selective decoupling arrangement, as designated by 8 and 9 in FIG. 1.
  • the ends of the common fiber optic cable 44 and the individual fiber optic cables 45, 46, 47 and 48 going to the receivers are fastened in an advantageously pluggable pin 43a.
  • a ball lens 41 is arranged on the common optical axis 40 in front of the end faces of the optical fibers 44 to 48.
  • a reflective diffraction grating 42 is arranged in the mating connector 43b, inclined to the optical axis 40.
  • the light coming from the common FO 44 is reflected here at different angles depending on the wavelength and in turn strikes the end faces of the outgoing FO 45 to 48 through the ball lens 41.
  • the light attenuation of such a demultiplexer is less than 3 dB, with crosstalk attenuation between the individual signals of more than 25 dB is reached.
  • FIG. 5 an attenuator for light signals in LWL 51 and 52 is shown schematically.
  • the LWL 51 and 52 are in turn contained in connector pins, in each of which a ball lens 53 and 54 are inserted.
  • a pin 56 is arranged so that it can be completely or partially interrupted, depending on its position. An improved one adjustability is still achieved in that the end of the pin 56 projecting into the beam path 55 is pointed or rounded.
  • FIG. 6 Another embodiment of an attenuator is shown schematically in FIG. 6.
  • the LWL 61 is contained in a plug pin with a spherical lens 63.
  • a light transmitter or light receiver 67 is also arranged in a plug pin 69 with ball lens 64.
  • Its electrical connection ends are designated 68.
  • a disc 66 which is designed as a gray wedge, is rotatably arranged in the beam path 65. By stretching the disk 66 around its indicated axis, the attenuation of the light passing through can be adjusted sensitively.
  • Attenuators of the type described are advantageously arranged in front of each light receiver in a transmission system in order to be able to adapt them to the overall attenuation of the transmission system in question. This prevents interference caused by the light receiver possibly being overdriven and improves the signal-to-noise ratio.
  • a smaller transmission system for optical signals is shown, which shows the universal suitability of the individual components for a modular system.
  • the first station shown in the left half of the picture is connected to the second station shown in the right half of the picture by the fiber optic core 71.
  • the light transmitters S71, 572, S73 and S74 in turn operate on different wavelengths, their light is in turn guided via two connection arrangements containing ball lenses and individual FO via the non-selective coupling arrangement 76 and the common FO 72 to the window-selective coupling arrangement 80 and with the FO core 71 connected.
  • the light from the transmitters S71 to 74 arriving in the second station in the right half of the figure is reflected in the fixed-selective coupling arrangement 81 and reaches the selective decoupling arrangement via the common optical fiber 75 79 and is distributed there, as already described, to the associated receivers E71, E72, E73 and E74. Operation in the opposite direction takes place via the transmitter S75 to the receiver E75, which in this case are arranged directly, advantageously in a pluggable manner in a plug with a spherical lens, on the window-selective coupling arrangements 80 and 81. It can be seen that the same components as are used in FIG. 1 can also be used advantageously for other combinations. This shows a further advantageous application for the already known principle of connecting two optical components via two spherical lenses.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Communication System (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Circuits Of Receivers In General (AREA)
EP82105675A 1981-08-29 1982-06-26 Système de transmission pour une utilisation multiple bidirectionnelle d'une fibre optique Expired EP0073314B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105675T ATE17426T1 (de) 1981-08-29 1982-06-26 Uebertragungssystem fuer die vielfachbidirektionale ausnutzung einer lichtwellenleiter-ader.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813134250 DE3134250A1 (de) 1981-08-29 1981-08-29 Verfahren fuer die vielfach-ausnutzung von lichtwellenleiter-adern im wellenlaengen-multiplex
DE3134250 1981-08-29

Publications (2)

Publication Number Publication Date
EP0073314A1 true EP0073314A1 (fr) 1983-03-09
EP0073314B1 EP0073314B1 (fr) 1986-01-08

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EP82105675A Expired EP0073314B1 (fr) 1981-08-29 1982-06-26 Système de transmission pour une utilisation multiple bidirectionnelle d'une fibre optique

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EP (1) EP0073314B1 (fr)
AT (1) ATE17426T1 (fr)
DE (1) DE3134250A1 (fr)
DK (1) DK345182A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123237A1 (fr) * 1983-04-23 1984-10-31 Licentia Patent-Verwaltungs-GmbH Multi/démultiplexeur optique
FR2569014A1 (fr) * 1984-08-08 1986-02-14 Sopelem Dispositif pour transmettre des signaux vehicules par n fibres optiques vers une fibre optique unique ou reciproquement
US4718056A (en) * 1985-03-20 1988-01-05 NKF Groep Nederlandsch Octrooibureau Optical multiplexer device
EP0265918A2 (fr) * 1986-10-31 1988-05-04 Alcatel SEL Aktiengesellschaft Système optique de transmission de données large bande, en particulier pour la zone de raccordement d'abonnés
EP0548648A2 (fr) * 1991-12-12 1993-06-30 Alcatel N.V. Dispositif de protection en forme d'anneau 1:N

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3417644A1 (de) * 1984-05-12 1985-11-14 Licentia Gmbh Verfahren zur bidirektionalen optischen nachrichtenuebertragung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153330A (en) * 1977-12-01 1979-05-08 Bell Telephone Laboratories, Incorporated Single-mode wavelength division optical multiplexer
DE2933245A1 (de) * 1978-08-17 1980-03-06 Nippon Electric Co Optisches nachrichtenuebertragungssystem
US4232385A (en) * 1977-07-12 1980-11-04 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Frequency division multiplexing system for optical transmission of broadband signals
US4244045A (en) * 1978-01-31 1981-01-06 Nippon Telegraph And Telephone Public Corporation Optical multiplexer and demultiplexer
US4265511A (en) * 1978-06-26 1981-05-05 U.S. Philips Corporation Detachable connector for optical fibres
EP0040706A1 (fr) * 1980-05-24 1981-12-02 Ibm Deutschland Gmbh Système de communication optique
EP0051727A1 (fr) * 1980-11-12 1982-05-19 Philips Kommunikations Industrie AG Branchement de guides de lumière de diamètres différents

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501640A (en) * 1967-01-13 1970-03-17 Ibm Optical communication system
NL180882C (nl) * 1976-05-31 1987-05-04 Philips Nv Optisch koppelelement en optische koppelinrichting met zulke koppelelementen.
DE3007958C2 (de) * 1980-03-01 1985-01-17 Hartmann & Braun Ag, 6000 Frankfurt Opto-elektonisches Übertragungssystem

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232385A (en) * 1977-07-12 1980-11-04 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Frequency division multiplexing system for optical transmission of broadband signals
US4153330A (en) * 1977-12-01 1979-05-08 Bell Telephone Laboratories, Incorporated Single-mode wavelength division optical multiplexer
US4244045A (en) * 1978-01-31 1981-01-06 Nippon Telegraph And Telephone Public Corporation Optical multiplexer and demultiplexer
US4265511A (en) * 1978-06-26 1981-05-05 U.S. Philips Corporation Detachable connector for optical fibres
DE2933245A1 (de) * 1978-08-17 1980-03-06 Nippon Electric Co Optisches nachrichtenuebertragungssystem
EP0040706A1 (fr) * 1980-05-24 1981-12-02 Ibm Deutschland Gmbh Système de communication optique
EP0051727A1 (fr) * 1980-11-12 1982-05-19 Philips Kommunikations Industrie AG Branchement de guides de lumière de diamètres différents

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123237A1 (fr) * 1983-04-23 1984-10-31 Licentia Patent-Verwaltungs-GmbH Multi/démultiplexeur optique
FR2569014A1 (fr) * 1984-08-08 1986-02-14 Sopelem Dispositif pour transmettre des signaux vehicules par n fibres optiques vers une fibre optique unique ou reciproquement
US4718056A (en) * 1985-03-20 1988-01-05 NKF Groep Nederlandsch Octrooibureau Optical multiplexer device
EP0265918A2 (fr) * 1986-10-31 1988-05-04 Alcatel SEL Aktiengesellschaft Système optique de transmission de données large bande, en particulier pour la zone de raccordement d'abonnés
EP0265918A3 (en) * 1986-10-31 1989-09-13 Standard Elektrik Lorenz Aktiengesellschaft Optical broad band communication transmission system, especially in the subscriber access area
EP0548648A2 (fr) * 1991-12-12 1993-06-30 Alcatel N.V. Dispositif de protection en forme d'anneau 1:N
EP0548648A3 (en) * 1991-12-12 1995-05-03 Alcatel Nv 1:n ring-type signal protection apparatus

Also Published As

Publication number Publication date
ATE17426T1 (de) 1986-01-15
EP0073314B1 (fr) 1986-01-08
DE3134250A1 (de) 1983-03-17
DK345182A (da) 1983-03-01

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